Elottr duster



Sept. 13, 1927.

F. TIEDKE FLOUR DUSTER Filed'March 29. 1926 2 Sheets-Sheet l H. F. TIEDKE FLOUR DUSTER a Filed March 29, 1926 2 Sheets-Sheet 2 /6/8a/8 Z5 5 l5 4 /3 t 17 q Z6 Z7 7' g ygmvzw- ATTORNEY Patented Sept. 13, 1927.

UNITED STATES PATENT OFFICE.

HANS F. TIEDKE, OF SAGINAW, MICHIGAN, ASSIGNOR TO BAKER PERKINS COMPANY, INCORPORATED, OF WHITE PLAINS, NEW YORK.

and-x FLOUR DUSTER.

Application filed March 29, 1926. Serial No. 98,206.

In the manufacture of bread, cakes, pastry and other bakery products, the dough or the forming machinery, or both, must be dusted with flour or other powdery or granular materials.

This invention relates to a sifter or duster adapted for use on loaf rounders and other material handling machines for bakeries, although the invention is adapted for many other rposes.

Sprinklers, sifters or clusters of this class usually contain a hopper with a screen bottom, either flat or semi circular in cross section. These machines are supplied with internal power driven agitating devices, generally in the form of bars mounted on radial arms secured to a central rocking shaft by which the bars are oscillated back and forth crosswise over the surface of the.

screen.

Gates or plates are usually adjustably applied to the under side of the screen when it is desired to cut off more or less of the working or sifting area. I have found that a great saving of material can be made by employing a duster that will sift very evenly over a large area and in which the rate of sifting or density of shower can be quickly and accuratelyregulated while the machine is in operation, so as to change at will from a heavy fallto a mere trace.

Another object is to reduce the liability of the operator injuring his fingers by accidentally putting them into the sifter, or on any part of it. Heretoforemany accidents have occurred because of the reciprocating paddles or other working parts. In my invention no exposed part has sufiicient movement nor is it of such shape as to cause such an accident.

I provide a form of agitator that does not permit the material to pack or arch within the sifter. My improved form of agitator also distributes the wear over the area of the screen so that the life of the screen is prolonged.

With the fore oing and certain other objects in view, w ich will appear later in the specification, my invention comprises the devices described and claimed and the equivalents thereof. y

In thedrawings, Fig. 1 is a perspective view, partly broken away to show the resin rocatiiifl' feed grille r Fig. 2 is a plan view of the grille.

Fig. 3 is an enlarged cross section of a pair Fig. 6 is a partial diagrammatic plan view of the driving mechanism shown in Fig. 4.

Fig. 7 is a view of one of the slides used for restricting the area to be dusted.

As is clearly shown in the drawings the sifter includes the usual box or container 1 having a screen bottom 2. The screen may be of any desired material and size of mesh. It is preferably fiat and may be removably fastened to the container by a frame 3 hav-' ing cross bars 4: to support the middle area of the screen, as shown in Fig. 4. The side edges of the screen-supporting frame have lateral projections 5 through which removable retaining rods 6 are passed, as illustrated in Fig. 1. By removing both rods the frame 3 can be detached and by removing one rod the frame can be opened by swinging downward, the other rod serving as a hinge pintle.

One or more slidable control plates 7 is secured to the under side of frame 3 and supported by screw heads or similar projections, as shown in Figs. 4. and 5. 1 By means ofthe control plates more or less of the screen area can be covered and rendered inoperative and the area to be dusted can be restricted both as to size and location.

My invention as applied to a screen bottom duster will now be described.

An agitating device distributes the material in the container uniformly over the whole working area of the screen. The agitating device consists of. a connected series of spaced wiping or scraping bar members 9, 9, the bottom edges of which are either close to, or actually in contact with the screen. The scraping members may be arranged in any desired configuration, but preferably like the bars of a grille as in Fig. 2. They may be perfectly flat on the bottom. or somewhat troughed or curved as desired, but are preferably substantially planiform so as to be capable of reciprocating, forpurposes that will now be described. g This rille has a movement toaiid=frii state is adjustable in is mp1s F ll U tude of movement. Several important functions are performed by such agrill'e, one being to prevent arching in the container. Another function of the grille is to maintaina uniform depth of material upon the entire working area of the screen, and by con tinually undercutting it, to spread and stir the material comprising the bottom of'th'e .ile.

p The top surface of the pile is thereby kept level and tendency to feed through the screen isthe'same for all parts of its area, regardless of whether there is much or'little material in '}the container.

The grille as it passes and repasses scrapes or Wipes over the entire screen area at each stroke; although the length of stroke need not 'be 'greater than. the'distance between two bars 959 of the grille. I

Full stroke jis'used when maximum showering is wanted, because the scrapingor rubbing-edges then produce greatest sifting effect; Atshorter stroke each wiping edge traverses less ofits screen area thanbeforeand consequently the density of pre-' cipitation v or dusting. is decreased. With very short trave'l of the grille'the siftingeffect becomes .that of a mere mist. Any desired rate ofsifting between these two ex.- tremes may be 'had bv merely altering the length of; travel .and whatever the rate, there will be uniform distribution .over all parts of the area to be overspread A still'fu rther function of the grille'bar when made as in Fi s. 2 and 8; with a'wide top l l and a narrow or sharp bottom elge 10, is to prevcnt arching acrossthe narrow spaces between successivegrille bars 9, 91 Archinisi is avoided beams the faces diverge downwardly and. afford no place for material'to build up between the bars, as is evident in Fig. 3. It is thus kept in rel ativelydoose condition suitable for sifting without anyv tendency to pack or form lumps. V V

The same idea is carried ou t 'in the containe'r structure, as shown. in 4i and 5, where thewalls a'rej made downwardly divergent 'to' prcvi'de an' additional means for preventing possibility of arching.

Len gthwise" back-andforth movement of thegrille is availed to lie" 7 the scr n perforations open byprod'u a tremor or pjalp itation. of the scre'en each strol're'. The way. this is accomplished will now be p e n'e Various means be" employed, but I Pre r er e h n nfF sw e the grille is provide'd w i th' tw o upright pins 13 which it is movedback' and forth. The pins loosely throiip h 'holes ina rodl l that is mounted to' sl 1e to-a'nd' frolengthwise in suitable bearings 15', 16' in the ends li o tainer- Springs 17 of'suitablestrength may be in- An end 19 of the nut may strike any Xed object, as' a boss 20 located on the container. The' impact of the nut against the boss brings the rod to a sudden stop and theresulting er in the grille produces the desired Ad stmg' jolting action upon the screen. the position of the nut 0n the rod"a'd us'ts and regulates the length ofstroke of the grille while the n'iachine is in actionl sition by' any suitable nut lock. A-conven-' ient' locking device is a slit or kerf 21 cut into the nut perpendicular to the axis and provided with a set screw QQby'Which-the' lip sosfor med can be madeto' pinch the threads on tlie ro d. I

To prevent accidents, a rim 18 is formed n'the nut 18 to cover the opening between the striking faces 19' and 20. I

Thegrille-actuating means maybe of any suitableidesign. For purpose of'illustration I have'shown a convenient-'driye as used by mein conjunction with ailoafforming machine Such a machine; shown 4, is equippcdwith a rotatable cam 23 on the shaft of cone 2%? of' a loaf molding machine; an oii-tlieend or the grille rod 1 1-"i'n' a" suitable'housi'ng 'orcross head 25 'isa' roller 26 adapted to engage the cam. The" roller is normally kept in contact with the peaks and also the depressions of the cam by means of a spring"27 compressible between the wall of} the container 1 and the cross head By adjusting the nut on the rod the roller an be made to; contactwith the peaks only thus causingthe' grille to exert considerable jarring effecton the screenand preventing the screen from clogging To the extent set forth in the claims, I have contributed to the art of sifting and dusting machinery, an. i" have accomplished the obj' ec' ts herein set forth in a practical manner, as exemlalifi ed' by urep're ferred embodiment which I have illustrated and;d es criln'ed. I

5 Having thus described my invention; what I claim and desire to secure by Letters Patent is:

p 1. The :ombinati on in a dusting'ma'chine. a receptacle having a" flat screen bot tom, with an agitator comprising a grille having spaced wiping members;- their sides The nutcan be locked in its adjusted pobeveled and their bottom edges yieldingly pressed upon said screen and actuating means for imparting to said agitator toand-fro movement over the face of said screen. I

2. The combination, ina dusting machine, of a receptacle having a screen bottom, with an agitator comprising a grille having spaced wiping members, their bottom edges close to said screen, actuating means adapted to impart to said agitator back-and-forth movement over the face of said screen, and adjusting means adapted to vary the length of stroke of said grille and to thereby vary the rate of dusting, for the purposes setforth.

3. The combination, in a dusting machine, with a grille and a longitudinally slidable rod adapted to impart toand-fro movement to said grille, means for varying the length of stroke of said rod comprising an adjustable stop adapted to halt the movement thereof, for the purposes set forth.

4. The combination, in a dusting machine,

of a material container having a screen b0ttom, connected series of spaced grille bars in substantially planiform arrangement and having their bottom edges close to said screen, actuating means adapted to impart to said bars to-and-fro movement, the length of travel of which is normally equal to substantially the distance between successive bars, and travel-adjusting means for varying the amplitude of said movement to vary the intensity of dusting action.

5. The combination, in a dusting machine, of a material container having a screen bottom, connected series of spaced grille bars in substantially planiform arrangement, actuating means adapted to impart to said bars to-and-fro movement and an adjustable stop member for abruptly halting said bars at various predetermined points in their travel, to cause them to produce agitation of said screen.

In testimony whereof, I affix my signature.

HANS F. TIEDKE. 

